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Tannoy™

noun
🔊/ˈtænɔɪ/
🔊/ˈtænɔɪ/
 (British English)
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  1. a system with loudspeakers used for giving information in a public place天朗扩音系统
    • to make an announcement over the Tannoy通过天朗扩音系统发布通知
    Topics Transport by bus and trainc2
    Word Origin1920s: contraction of tantalum alloy, which is used as a rectifier in the system.